暗挖隧道注浆-降压联合地下水控制技术

动水条件下承压水的注浆止水及加固问题，是暗挖隧道地下水控制的重要难题，在浆液配比、注浆参数等方面的设计施工经验较少。以某地铁区间联络通道的地下水控制工程为背景，结合该通道地质条件复杂、承压水头高、突涌水量大等施工现状，基于注浆-降压联合的地下水控制思路，探索了高承压水头条件下的WSS双液注浆止水施工技术，并通过现场探测和地面沉降监测研究其止水加固效果。结果表明，采用注浆-降压联合的地下水控制及加固方案，在显著承压性的地下水含水层注浆止水加固中取得了良好的效果，既能够保证地下通道的注浆过程顺利进行，又能确保地下水治理效果，并遏制围岩的变形发展，各部位变形均满足控制指标。

TECHNOLOGY OF GROUNDWATER CONTROL COMBINATION OF GROUTING AND WATER PRESSURE REDUCE OF SHALLOW TUNNEL

The problem of grouting to stop water and reinforce under the condition of dynamic water pressure is an important problem of groundwater control of shallow tunnel with fewer experiences in the aspects of ratio of slurry, grouting parameters of design and construction. Taking the underground water control engineering of a subway connecting passage as the background, combined with the current situation of complex geological conditions, high artesian head, and phenomenon of water inrush, construction technology of joint control scheme of WSS double fluid grouting under the condition of high pressure water head was presented, based on the idea of grouting, pressure decreases, and the control effect of the technology was studied by the method of scene detection and land subsidence monitoring. The results show that the joint control scheme has gained a good effect of grouting and reinforce under the condition of dynamic water pressure, and can ensures that the underground tunnel grouting process smoothly, achieve good groundwater treatment effect and ensure underground tunnel deformation control in a reasonable range.